JPH0255714U - - Google Patents
Info
- Publication number
- JPH0255714U JPH0255714U JP13477488U JP13477488U JPH0255714U JP H0255714 U JPH0255714 U JP H0255714U JP 13477488 U JP13477488 U JP 13477488U JP 13477488 U JP13477488 U JP 13477488U JP H0255714 U JPH0255714 U JP H0255714U
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- resistor
- fet
- input terminal
- output voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
第１図は本考案に係るウイーンブリツジ型発振
回路の回路図、第２図はその各部の電圧の状態の
波形図、第３図は従来のウイーンブリツジ型発振
回路の回路図である。
１０……第１のオペアンプ、１１……第２のオ
ペアンプ、２０……ＦＥＴ、Ｃ１０，Ｃ１１，Ｃ
１２……コンデンサ、Ｒ１０，Ｒ１１，Ｒ１２，
Ｒ１３，Ｒ１４……抵抗、Ｄ１……ダイオード。
FIG. 1 is a circuit diagram of a Wien-Bridge type oscillation circuit according to the present invention, FIG. 2 is a waveform diagram of voltage states at various parts thereof, and FIG. 3 is a circuit diagram of a conventional Wien-Bridge type oscillation circuit. 10... First operational amplifier, 11... Second operational amplifier, 20... FET, C 10 , C 11 , C
12 ... Capacitor, R 10 , R 11 , R 12 ,
R13 , R14 ...Resistor, D1...Diode.
Claims (1)
力端子との間には負帰還用の抵抗を接続するとと
もに、該オペアンプの負入力端子に抵抗を介して
ＦＥＴのドレインが接続され、該オペアンプの正
入力端子と出力端子との間には正帰還用のコンデ
ンサと抵抗との直列回路が接続されるとともに、
該オペアンプの正入力端子とアースとの間にコン
デンサと抵抗との並列回路が接続されてなり、前
記ＦＥＴが可変抵抗手段として用いられたウイー
ンブリツジと、平滑してＦＥＴのゲート電圧を制
御する抵抗とコンデンサとの並列回路とを備えた
ウイーンブリツジ型発振回路において、 前記オペアンプの出力電圧を与えるべき第２の
オペアンプを設けて、該第２のオペアンプの出力
電圧を前記ＦＥＴのゲートへ与える構成にしてお
り、第２のオペアンプの入力側に、前記オペアン
プの出力電圧を調整すべき出力電圧設定手段を設
けてあることを特徴とするウイーンブリツジ型発
振回路。[Claims for Utility Model Registration] A resistor for negative feedback is connected between the operational amplifier and the negative input terminal and output terminal of the operational amplifier, and the drain of the FET is connected to the negative input terminal of the operational amplifier via the resistor. A series circuit of a positive feedback capacitor and a resistor is connected between the positive input terminal and the output terminal of the operational amplifier, and
A parallel circuit of a capacitor and a resistor is connected between the positive input terminal of the operational amplifier and the ground, and the FET is used as a variable resistance means to smooth and control the gate voltage of the FET. In a Wien Bridge type oscillator circuit including a parallel circuit of a resistor and a capacitor, a second operational amplifier to which the output voltage of the operational amplifier should be applied is provided, and the output voltage of the second operational amplifier is applied to the gate of the FET. 1. A Wien Bridge type oscillation circuit, characterized in that an output voltage setting means for adjusting an output voltage of the operational amplifier is provided on the input side of the second operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13477488U JPH0255714U (en) | 1988-10-14 | 1988-10-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13477488U JPH0255714U (en) | 1988-10-14 | 1988-10-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0255714U true JPH0255714U (en) | 1990-04-23 |
Family
ID=31393830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13477488U Pending JPH0255714U (en) | 1988-10-14 | 1988-10-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0255714U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49106263A (en) * | 1973-02-09 | 1974-10-08 | ||
| JPS5092074A (en) * | 1973-12-12 | 1975-07-23 | ||
| JPS55114005A (en) * | 1979-02-22 | 1980-09-03 | Yokogawa Hokushin Electric Corp | Oscillation voltage control system of wien bridge oscillator |
-
1988
- 1988-10-14 JP JP13477488U patent/JPH0255714U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49106263A (en) * | 1973-02-09 | 1974-10-08 | ||
| JPS5092074A (en) * | 1973-12-12 | 1975-07-23 | ||
| JPS55114005A (en) * | 1979-02-22 | 1980-09-03 | Yokogawa Hokushin Electric Corp | Oscillation voltage control system of wien bridge oscillator |